1 /*
2 * Copyright (C) 2012 Google Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #ifndef IdTargetObserverRegistry_h
27 #define IdTargetObserverRegistry_h
28
29 #include "wtf/Forward.h"
30 #include "wtf/HashMap.h"
31 #include "wtf/HashSet.h"
32 #include "wtf/PassOwnPtr.h"
33 #include "wtf/text/StringHash.h"
34
35 namespace WebCore {
36
37 class IdTargetObserver;
38
39 class IdTargetObserverRegistry {
40 WTF_MAKE_FAST_ALLOCATED;
41 friend class IdTargetObserver;
42 public:
43 static PassOwnPtr<IdTargetObserverRegistry> create();
44 void notifyObservers(const AtomicString& id);
45
46 private:
IdTargetObserverRegistry()47 IdTargetObserverRegistry() : m_notifyingObserversInSet(0) { }
48 void addObserver(const AtomicString& id, IdTargetObserver*);
49 void removeObserver(const AtomicString& id, IdTargetObserver*);
50 void notifyObserversInternal(const AtomicString& id);
51
52 typedef HashSet<IdTargetObserver*> ObserverSet;
53 typedef HashMap<StringImpl*, OwnPtr<ObserverSet> > IdToObserverSetMap;
54 IdToObserverSetMap m_registry;
55 ObserverSet* m_notifyingObserversInSet;
56 };
57
notifyObservers(const AtomicString & id)58 inline void IdTargetObserverRegistry::notifyObservers(const AtomicString& id)
59 {
60 ASSERT(!m_notifyingObserversInSet);
61 if (id.isEmpty() || m_registry.isEmpty())
62 return;
63 IdTargetObserverRegistry::notifyObserversInternal(id);
64 }
65
66 } // namespace WebCore
67
68 #endif // IdTargetObserverRegistry_h
69